Re: Do these numbers look right?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> 


You should consider going up to 1,200 turns.  Better Ls/Lp ratio will give
better output.  Consider using #28 AWG wire size especially with the 30 mA
xmfr.

If you contact a major plumbing supply contractor you can buy it in 50 ft.
and 100 ft lengths.  First, however, always use a "scrap wire" primary to
determine your tune point before investing in the copper tubing.

Z = v/a = 12000/.03 = 400 K Ohms impedance

C = 1/(2 * 3.14 * 60Hz *4e5 Ohms  = 6.67e-9 F = .0067 uF (Cres value)

Cbest = 1.6 * Cres = 1.6 * .0067 uF = .01 uF

Pri cap should be 1.6 x Cres value.  Around 0.01 with a 2 gap stationary gap
should work very well.

Never use .007 (resonant value) as this could damage your NST with it's
resonance if the spark gap should misfire ---- resonant rise of potential up
to 2.22 x Erms.

No need for blown gap at this low power level.  You can use carriage bolt
heads with their large surface area --- inexpensive and good performance.
Set total gap at 90 mils for tuning and 180 mils (.18") after initial
tuning.

Dr. Resonance
 >
 > NST = 12,000v, 30ma, 60hz
 > Secondary = #22 wire, 20" long, 4" diameter, 765 turns-at-97%
 > Primary = flat spiral, I.D. = 6", 15 turns, .25" pipe, .25" spacing,
 > width=7.25"
 > Capacitor = .007uf
 > Toroid = Dmin= 4", Dmaj= 24"
 >
 > The spreadsheet says secondary res F = 257kh, primary res F = 221khz.
 >
 > My concern is if I use any larger cap, I can't get the prim/sec parameters
 > to match good enough. Also, I don't have any material for a toroid here
 > that I can look at so I assume 4" almunin flex hose but I don't know if
24"
 > is realistic. Lastly, the primary requires 53' of copper tubing. I am not
 > sure where to buy such a long length. I have seen only 25' at Home Depot.
 >
 > Thanks.
 >   JC
 >
 >
 >